Incidentally, the 'Cassandria' Tilbury on the 1901 census appears on freebmd as Rose Cassandied Tilbury, registered Sep 1896, Bath. There's a Henrietta Larner registered in 1901 in London, but this one appears on the 1901 census with a different family.
I suspect Elizabeth was Elizabeth Piercey originally.
Elizabeth Piercey m. possibly Charles Edwin Tilbury, Bath, Mar q. 1892
possible children:
Lucy Christian, Sep q. Bath 1892
Christopher William C, Jun q. Bath 1894
twins, Hilda Louise and Lillian May, Jun q. Bath 1896 (presumably due to the spacing these were from another couple)
Rose Cassandied (probably Cassandria) Sep q. Bath 1896
Charles Edwin dies Dec 1898, aged 31, so the remarriage of Elizabeth must be sometime between Dec 1898 quarter and the 1901 census
Still can't find the marriage. What I do find is a possible remarriage of Elizabeth Tilbury to George Coleshill, Dec 1900 in Fulham (the other two options, Frank Forth Camidge and Charlotte Anne Weatherley are definitely married in 1901).
A George Coleshill appears in 1901 in Fulham, apparently widowed, but I can't find the death of his Elizabeth (he appears with various children from an earlier marriage).
I find in Ontario marriages:
Constance Henryetta Larner, aged 21, born England, parents William Larner and Elizabeth Piercey, m. Robert Alvin Carson, aged 37, b. Ailsa Gray, parents John Carson and Annie Fawkes, married at Granton, Middlesex Co, Ontario, 14 Apr 1917.
Witness: Lillian Quinn.
Also, this seems to be Elizabeth's son Christopher in WWI in Canada:
http://data2.archives.ca/cef/gpc016/638031a.gifhttp://data2.archives.ca/cef/gpc016/638031b.gifStill can't find:
Birth of Henrietta/Constance Henryetta
Marriage of William and Elizabeth.